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Showing 1 to 20 of 304 for “"Reaction rates"”.
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Modeling effective isotopic fractionation in groundwater aquifers with heterogeneous reaction rates
… chromate, nitrate, selenate, etc.) reduction reactions transform toxic, soluble compounds into non-toxic forms. Reduction induces isotopic fractionation, which may thus be used to determine the amount of reaction that has occurred. However, when the Rayleigh distillation equation is used to …
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Effect of Coatings on Mineral Reaction Rates in Acid Mine Drainage
… that address the effect of coatings on rates of mineral reactions that occur in acid mine drainage (AMD) environments. The two major projects investigated how diffusion-limited transport of reactants through pore spaces in coatings on mineral grains affects the reaction rate of the …
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Measurement of Proton Transfer Reaction Rates in a Microwave Cavity Discharge Flowing Afterglow
<p>The reaction rate coefficients between the hydronium ion and the molecules ethene (<em>C<sub>2</sub>H<sub>4</sub></em>), propene (<em>C<sub>3</sub>H<sub>6</sub></em>), 1-butene (<em>C<sub>4</sub>H<sub>8</sub></em>) and hydrogen sulfide (<em>H<sub>2</sub>S</em>) were measured at 296 K. The …
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Formation and dissociation reaction rates and relevant kinetic behavior of propane gas hydrate (PGH)
The formation and dissociation reaction rates and their kinetic behavior of propane gas hydrate (PGH) within the well-defined sediment particle's packing structures were experimentally investigated in this work by using a multi-phase heterogeneous reaction system, consisting of propane gas (g), …
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Reaction Rates For The Dehalogenation Of Trichloroethylene Using Various Types Of Zero-valent Iron
… with the experimental setup, could influence reaction rates. Surface area studies confirmed that the smaller iron particles, such as the nanoscale iron, have a greater surface area per unit mass. The large mass and volume normalized rate constant, kMV, obtained for the nanoscale iron was a …
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A model for the calculations of solvent effects on reaction rates for process design purposes
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.
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The Mass-Spectrometric Sampling of Shock-Tube Flows for The Study of High-Temperature Reaction Rates
Made available in DSpace on 2014-12-09T17:36:38Z (GMT). No. of bitstreams: 1 7013469.pdf: 5177602 bytes, checksum: c88bfd5896e3b24b258052ae88f10b89 (MD5) Previous issue date: 1969
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Analysis of the application of collision cross sections and ion neutral reaction rates in the upper atmosphere modeling
… as collision cross sections and ion-neutral reaction rates) used in the upper atmospheric modeling for Earth and other planets are presented. This work gives the first complete compendium of the electron impact cross sections and ion neutral reaction rates used in aeronomic studies. This data …
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Reconsideration of Inherent Neutron Sources in Liquid Fuel of Molten Salt Reactors
… neutron sources from alpha-n and gamma-n reactions in molten fluoride fuel salts using current gamma-n and alpha-n cross-sections and codes where possible. Original inherent neutron source was calculated for Molten Salt Reactor Experiment (MSRE) in 1959 using then-determined alpha-n …
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On the structure of laminar diffusion flames
… in the limiting case of large, although finite, reaction rates. It is shown that the chemical reaction takes place only in a very thin region or "chemical boundary layer" where convection effects may be neglected. Then the temperature and mass fraction distributions within the reaction zone are …
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Inexact methods for the chemical master equation with constant or time-varying propensities, and application to parameter inference
Complex reaction networks arise in molecular biology and many other different fields of science such as ecology and social study. A familiar approach to modeling such problems is to find their master equation. In systems biology, the equation is called the chemical master equation (CME), and solving …
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Reaction calorimetry applied to kinetic problems. The design and construction of an isothermal calorimeter with heat compensation by the Peltier effect, and the application of the calorimeter in the study of reaction kinetics in solvent/water mixtures.
… designed and constructed in order to investigate reaction rates in solventwater mixtures. Because a thermal method was used a constant temperature environment was essential and this was achieved by using a water bath controlled to + 0.0010C. This callorinieter has been used to study the alkaline …
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Removal of dissolved organic matter from surface waters by coagulation with trivalent iron
… compounds was also determined, along with the reaction rates. DOC removal by coagulation was size dependent. Compounds over 5,000 d were readily removed while compounds under 1,000 d were largely unaffected. Acidic and basic molecules were precipitated much more effectively than neutral ones. …
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High temperature alkali corrosion kinetics of low expansion ceramics
… containing 1.0 +/- 0.1 vol% alkali. The linear reaction rates observed at all temperatures indicate that the alkali corrosion of Si,N, and SiC is interfaced-controlled with an activation energy of 199 and 104 kJ/mol, respectively. The overall reaction in these materials involves a complex …
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Measurement of the rate of hydrogen atom abstraction from methane and ethane by muonium
Reaction rates for the gas-phase reactions Mu+ CH₄ → MuH + CH₃ and Mu + C₂H₆ → MuH + C₂H₅ have been measured using μSR over the temperature ranges 626-821 K and 511-729 K respectively. The usual Arrhenius plots for each data set are linear. The measured parameters A are 5.7 [+4.8 superscript and …
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An in-situ interdiffusion method for harvesting energy from an aluminum-water reaction
… into liquid gallium as well as to quantify the reaction of the aluminum-gallium solution in water. Experiments are conducted to measure the diffusion and reaction rate constants, and the data is fit to the Arrhenius equation to predict the diffusion and reaction rates at elevated system …
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NMR Investigations of Structure in Pressure and Cold Denatured Proteins
… the cold denaturation studies, hydrogen exchange rates in model amides were measured at various temperatures and pressures to determine the effect of the extreme conditions. These reaction rates are compared to those obtained by correcting extant data for temperature and pressure.
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Understanding Structure-Property Relationships for Palladium-Gold Nanoparticles as Colloidal Catalysts
… than monometallic Pd catalysts in various reactions; however, the enhancement mechanism is not completely clear for most reactions. This thesis addresses the investigation of PdAu NP catalysts with emphasis on the structureproperty relationships in water-phase reactions, using hydro …
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